Unexpected error during – Elasticsearch Log Diagnostic

Remediate Elasticsearch Issues

Opster detects and predicts root causes of Elasticsearch problems

Learn More

Opster has analyzed this log so you don’t have to
Navigate directly to one of the sections in this page :

Troubleshooting Background – start here to get the full picture       
Log Context – usefull for experts
Related Issues – selected resources from the community  
About Opster – offering a diffrent approach to troubleshoot Elasticsearch

Check My Elasticsearch 


Troubleshooting background

To troubleshoot Elasticsearch log “Unexpected error during” it’s important to know common problems related to Elasticsearch concepts: discovery, join, node. See below-detailed explanations complete with common problems, examples and useful tips.

Nodes in Elasticsearch

What it is

Simply explained a node is a single server that is part of a cluster. Each node is assigned with one or more roles, which describes the node responsibility and operations – Data nodes stores the data, and participates in the cluster’s indexing and search capabilities, while master nodes are responsible for managing the cluster activities and storing the cluster state, including the metadata.

While it’s possible to run several Node instances of Elasticsearch on the same hardware, it’s considered a best practice to limit a server to a single running instance of Elasticsearch.

Nodes connect to each other and form a cluster by using a discovery method. 

Roles
Master node

Master nodes are in charge of cluster-wide settings and changes  – deleting or creating indices and fields, adding or removing nodes and allocating shards to nodes. Each cluster has a single master node that is elected from the master eligible nodes using a distributed consensus algorithm and is reelected if the current master node fails.

Coordinator Node (aka client node)

Coordinator Node – is a node that does not hold any configured role. It doesn’t hold data, not part of the master eligible group nor execute ingest pipelines. Coordinator node serves incoming search requests and is acting as the query coordinator – running the query and fetch phases, sending requests to every node which holds a shard being queried. The client node also distributes bulk indexing operations and route queries to shards copies based on the nodes responsiveness.


Log Context

Log ”Unexpected error during” classname is NodeJoinController.java
To help get the right context about this log, we have extracted the following from Elasticsearch source code

         public void clusterStateProcessed(String source; ClusterState oldState; ClusterState newState) {
            for (MembershipAction.JoinCallback callback : callbacks) {
                try {
                    callback.onSuccess();
                } catch (Exception e) {
                    logger.error(() -> new ParameterizedMessage("unexpected error during [{}]"; source); e);
                }
            }
        }
    }







To help troubleshoot related issues we have gathered selected answers from STOF & Discuss and issues from Github, please review the following for further information :

Unexpected Error While Indexing Mon
discuss.elastic.co/t/unexpected-error-while-indexing-monitoring-document-org-elasticsearch-xpack-monitoring/120750

 

Unexpected Error While Indexing Mon
discuss.elastic.co/t/unexpected-error-while-indexing-monitoring-document-with-7-0/176463

 


About Opster

Incorporating deep knowledge and broad history of Elasticsearch issues. Opster’s solution identifies and predicts root causes of Elasticsearch problems, provides recommendations and can automatically perform various actions to manage, troubleshoot and prevent issues

We are constantly updating our analysis of Elasticsearch logs, errors, and exceptions. Sharing best practices and providing troubleshooting guides.

Learn more: Glossary | Blog| Troubleshooting guides | Error Repository

Need help with any Elasticsearch issue ? Contact Opster

Did this page help you?

Get an Elasticsearch Check-Up


Check if your ES issues are caused from misconfigured settings
(Free 2 min process)

Check